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03-25-2008, 11:15 AM
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| physics doppler effect?
A swimming duck paddles the water with its feet once per time interval of 1.8 s, producing surface waves with this period. The duck is moving at constant speed in a pond where the speed of surface waves is 0.30 m/s, and the crests of the waves ahead of the duck have a spacing of 0.20 m. What is the duck's speed? Express your answer using two significant figures. How far apart are the crests behind the duck? Express your answer using two significant figures.      |
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